SEO hosting is not different from other web hosting plans. It is just a marketing ploy to attract people who are more concerned about SEO than their actual website.

- Unlimited number of IP addresses,

FYI, for each IP you will need to provide justification and if say you want IP addresses in bulk for SEO purposes, then I am sure reliable hosting companies will tell you to look another hosting company.

- Unlimited bandwidth,

Nothing is unlimited on this earth and web hosting field is not exceptional.

I'll tell you that if I found some company that advertised themself as SEO hosting, I would be thinking I'm probably going to get the opposite result. SEO comes from building a site that's worth visiting, and has very little to do with much else.